Power converter circuits by W Shepherd; Li Zhang Crowther

By W Shepherd; Li Zhang Crowther

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17. Sketch in proportion the waveforms of e, V, and load current IL if V ‫ ס‬Em/2. Calculate the average value of the supply current and the load current if Em ‫ ס‬100 V and R ‫ ס‬25 ⍀. What effect would there be on the circuit function and average load current if an open circuit failure occurred on (a) diode D1 and (b) diode D3? 13 Sketch typical steady-state current waveforms for the diode circuit with capacitor smoothing shown in Fig. 4. 14 Deduce and sketch the waveforms of the voltages across the supply, the diode, and the load for the rectifier circuit of Fig.

Calculate the average and rms values of the load voltage if Em ‫ ס‬330 V. Define a ripple factor for this load voltage and calculate its value. 8 A single-phase, full-wave diode bridge supplies power to a resistive load from a sinusoidal voltage source e ‫ ס‬Em sin ␻t. Show that the load current waveform created by the natural commutation of the diodes is such that its Fourier series does not contain a term of supply frequency. 9 Sketch the current waveform of the rectifier circuit (Fig. 16) if e ‫ס‬ Em sin ␻t and V ‫ ס‬Em/2.

Calculate the average load current and the rms values of a few harmonic current components using the Fourier series for the load voltage if R ‫␻ ס‬L ‫ ס‬110 ⍀. Hence, calculate the load current and the current ripple factor. 29 A resistive load is supplied through a diode connected in the secondary circuit of a single-phase transformer with low leakage reactance (Fig. 19). Sketch the forms of the load current, supply current, and diode voltage over a supply voltage period. 30 Deduce and sketch current waveforms for the half-wave rectifier circuit of Fig.

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